Calendar weighing and feeding system for manufacturing electrode foil, fuel cell, capacitor foil, etc.

Abstract

The present invention relates to a metering and feeding system for dry coating battery electrodes with a powder material (4) applied in a continuous flow of powder material through a roller gap (13) between two calender rollers (14, 15), wherein a container (9) for containing the powder material (4) is positioned in front of the roller gap (13), the container is fed through a conveyor trough (5), and the walls (10, 10a, 11) of the container are designed to widen conically from an inlet baffle (29) and an upper filling gap (22) toward an outlet gap (23) opposite the roller gap (13).

Claims

1. A metering and feeding system for dry coating battery electrodes with a powder material supplied in the form of a continuous flow of powder material through a roller gap between two calender rollers, wherein a storage container for receiving the powder material is positioned upstream of the roller gap and supplied via a conveyor trough, and the lower part of the storage container has at least two opposing walls forming a chute that spreads conically and uniformly from an upper inlet gap toward an outlet gap opposite the roller gap.

2. The metering and dispensing system according to claim 1, wherein the front wall, together with the opposing rear wall, forms the chute that spreads out in a conical shape, and the side walls are parallel to each other.

3. The metering and dispensing system according to claim 1, wherein the front wall, together with the opposing rear wall, forms the chute that spreads out in a conical shape toward each other, and the side wall also spreads out in a conical shape.

4. The metering and dispensing system according to claim 1, wherein the front wall is parallel to the opposing rear wall, and the side walls are conically flared relative to each other.

5. The metering and dispensing system according to claim 1, wherein a constant filling level is maintained in the chute by a filling level sensor and / or a supply controller.

6. The metering and dispensing system according to any one of claims 1 to 5, wherein the width of the outlet gap of the storage container is 80% smaller than the length of the calender roller, and preferably 10 mm smaller than the target width of the drying film.

7. The metering and dispensing system according to any one of claims 1 to 6, wherein the depth of the chute is in the range of 10 to 20 mm, and the height is in the range of 100 to 1000 mm, preferably 500 mm.

8. The weighing and feeding system according to any one of claims 1 to 7, wherein the powdered raw material is mixed and finely dispersed in a mill or a pneumatic conveying system located on the inlet side, and then falls by gravity into a supply hopper having a conveyor trough that conveys horizontally.

9. The weighing and supplying system according to claim 8, wherein the conveyor trough is driven at an inclination with respect to the conveying direction by a vibration drive device.

10. The weighing and dispensing system according to any one of claims 1 to 9, wherein the accumulation region for the powdered raw material is located in the lower region of the storage container, and the accumulation region extends from the inside of the chute to the roller gap of the calender roller.

11. The metering and dispensing system according to any one of claims 1 to 10, wherein the outlet gap of the chute protrudes into the roller gap.

12. The metering and dispensing system according to any one of claims 1 to 11, wherein the side wall has a lateral extension that extends beyond the outlet gap.

13. The metering and dispensing system according to any one of claims 1 to 11, wherein the storage container is designed to be vertically movable up and down from the roller gap.

14. The weighing and dispensing system according to any one of claims 1 to 13, wherein the opposing side walls form a powder raw material contact guide surface between them, and each of the guide surfaces is designed to be linear or convex curved.

15. A metering and feeding system for dry coating battery electrodes with a powder material supplied in a continuous flow of powder material through a roller gap between two calender rollers, wherein a storage container for receiving the powder material is positioned in front of the roller gap and supplied via a conveyor trough, the lower part of the storage container forms a chute, the inlet side of the chute is formed by an inlet baffle, and the powder material is smoothly introduced through the inlet baffle.

16. The metering and dispensing system according to claim 15 and any one of claims 1 to 14, wherein the inlet baffle comprises at least two collision surfaces arranged in the flow direction, one in front of the other and at opposite angles to each other.

17. The metering and dispensing system according to claim 16, wherein the inclination of at least two impact surfaces with respect to the vertical can be adjusted individually and / or jointly.

18. The metering and feeding system according to claim 16 or 17, wherein the penetration depth of the drop edge of the conveyor trough into the powder material transfer chamber is adjustable in order to form an adjustable first projection parabola for the powder material falling onto a first impact surface.

19. A metering and dispensing system according to any one of claims 15 to 18, wherein an adjustable second projection parabola is formed at the transition from the first impact surface to the second impact surface, and an adjustable third projection parabola exists from the second impact surface to the center of the filling gap.

20. The weighing and dispensing system according to any one of claims 1 to 19, wherein the inlet baffle is tapered and has an offset height, allowing the storage container to be moved toward the conveyor trough.

21. The metering and dispensing system according to any one of claims 1 to 20, wherein a suction and extraction nozzle is provided to create a vacuum inside the storage container.

22. A weighing and dispensing system according to any one of claims 1 to 21, wherein a dustproof connection is provided between the conveyor trough and the storage container by an elastically deformable seal that substantially prevents the transmission of vibration from the conveyor trough to the storage container.

23. The metering and dispensing system according to any one of claims 1 to 22, wherein the vacuum in the conveyor trough draws outside air through a filter into the interior of the storage container and above the inlet baffle, thereby further flushing the powdered raw material with fresh air before it enters the inlet baffle, thereby improving its fluidity.

24. A method for metering and supplying powder material for dry coating battery electrodes with powder material supplied in the form of a continuous flow of powder material through a roller gap between two calender rollers, wherein a storage container for receiving the powder material is positioned above the roller gap, the storage container is supplied via a conveyor trough, the lower part of the storage container forms a chute, the inlet side of the chute is formed by an inlet baffle, and the powder material is loosened as it flows over the inlet baffle.

25. The method according to claim 24, wherein the powder material transfer chamber above the inlet baffle in the storage container is flushed with filtered fresh air.

26. The method according to claim 24 or 25, suitable for operating the metering and dispensing system according to any one of claims 1 to 23.

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